非晶NbGe超导薄膜中运动涡旋晶格的流动和倾斜诱导取向
Flow and Tilt-Induced Orientation of the Moving Vortex Lattice in Amorphous NbGe Superconducting Thin Films
摘要：
本文研究了非晶超导NbGe薄膜中磁通流态运动涡旋晶格的取向和形变。采用锁模技术，我们检测如何移动晶格变形和他们的取向变化的磁场是从正常的倾斜到薄膜表面。对于高倾斜角，晶格取向与倾斜方向平行对齐。同时，对于低倾角的晶格取向依赖于涡旋速度和速度诱导的重取向发生。当运动晶格发生形变时，再取向的特征速度变化很大。所观察到的功能是一致的扩展键波动理论，揭示了各向异性振动涡旋运动是必不可少的，用于确定运动的涡旋晶格的取向。
英文摘要：
The orientation and deformation of moving vortex lattices in the flux-flow state have been investigated in amorphous superconducting NbGe thin films. Employing a mode-locking technique, we detect how moving lattices deform and their orientation changes as a magnetic field is tilted from normal to the film surface. For high tilt angles the lattice orientation is aligned parallely with the tilt direction. Meanwhile for low tilt angles the lattice orientation depends on the vortex velocity and a velocity-induced reorientation occurs. The characteristic velocity for the reorientation varies remarkably as the moving lattices deform. The observed features are consistent with an extended bond-fluctuation theory, revealing that the anisotropic shaking vortex motion is essential for determining the orientation of moving vortex lattices.
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